package com_djm_2025_06_05.demo5;

public class Computer {

    public void powerOn() {
        System.out.println("打开电脑....");
    }

    public void powerOff() {
        System.out.println("关闭电脑....");
    }

    public void useDevice(USB usb) {
        usb.openDevice();
        if(usb instanceof KeyBoard) {
            KeyBoard keyBoard = (KeyBoard) usb;
            keyBoard.input();
        }

        if(usb instanceof  Mouse) {
            Mouse mouse = (Mouse) usb;
            mouse.click();
        }

        usb.closeDevice();
    }
}
